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Variable transmission composite interference filter

a composite interference filter and variable transmission technology, applied in the field of light filters, can solve problems such as the decrease of transmitted light, and achieve the effect of reducing transmitted ligh

Inactive Publication Date: 2012-11-20
EASTMAN PERFORMANCE FILMS LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

"The present invention provides interference filters that have two band pass interference filters in a single composite interference filter. These filters have similar band pass curves that are focused on the same wavelength for light incident at a given angle. However, the band pass curve shifts of the filter components are different, which results in a decrease of transmitted light as the angle of incidence increases. This design helps to improve the performance of the interference filters."

Problems solved by technology

The band pass curve shifts of the filter components, however, are dissimilar, which results in a decrease of transmitted light as the angle of incidence diverges from the given angle.

Method used

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Examples

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Embodiment Construction

[0015]The present invention provides interference filters that can be used in a wide variety of applications, including, for example, as a privacy barrier that restricts complete viewing of an area through a window onto which a filter has been affixed.

[0016]Interference filters of the present invention are composite filters that comprise at least two band pass interference filters that have been combined into a single composite filter. The two band pass filters have light transmission bands that are centered on the same wavelength for light that is incident on the filter at a given angle.

[0017]FIG. 1a shows a first filter that has a band pass centered at wavelength X for light that is incident at a given angle Z. FIG. 2a shows a second filter that has a band pass centered at wavelength X for light that is incident at the same given angle. FIG. 1b shows a transmission band for the filter shown in FIG. 1a at an angle that is oblique to angle Z. The transmission band shown in FIG. 1b h...

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Abstract

Now, according to the present invention, interference filters are provided that incorporate two band pass interference filters into a single composite interference filter. The two filters each have at least one band pass curve that is centered at the same wavelength for light that is incident at a given angle to the filter surface. The band pass curve shifts of the filter components, however, are dissimilar, which results in a decrease of transmitted light as the angle of incidence diverges from the given angle.

Description

FIELD OF THE INVENTION[0001]The present invention is in the field of light filters in general, and, in particular, the present invention is in the field of band pass interference filters used to selectively transmit desired wavelengths of visible light.BACKGROUND[0002]Devices that filter selected wavelengths of light are well known and have been in use for many years. Typically, a source of white light or light comprising components from wavelengths throughout the visible spectrum is filtered so as to transmit only the desired wavelengths. Among the various filters that are conventionally available for use as a light filter, absorption filters and interference filters are in common use.[0003]One type of interference filter utilizes a dielectric layer disposed between two very thin layers of a reflective material. The resulting filter transmits light within a band of the visible spectrum. The wavelength band of the transmitted light is not constant at all angles of incidence, however...

Claims

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Application Information

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Patent Type & Authority Patents(United States)
IPC IPC(8): G02B1/10
CPCG02B5/288G02B5/28
Inventor LI, JAIME ANTONIOHUBBARD, COBY LEE
Owner EASTMAN PERFORMANCE FILMS LLC
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